Sizing is literally the worst I have ever encountered, and I actually make and alter clothing for a living. I used the size chart (which is different for every dress, btw) to find my size in not one, but three different dresses. They were sold ...out of the dress I needed (Grace), so I opted for another style that was close enough, the Kiko. The bodice is MUCH too short, and the bust cups not nearly deep enough to hold me in place. I was literally spilling out of the dress. Moreover, the bodice had no structure, so even if my bust did fit, the bodice would sag under the bustline.
So I exchanged for another dress, the Maria, hoping that because it was an empire waist I wouldn't have the same issue of the bodice being too short. I was wrong. Somehow, despite the fact that I ordered a dress that matched my measurements, this dress was just as bad as the Kiko dress. It was somehow uncomfortably tight and simultaneously too loose, due to the fact that the cups were, again, not cut deep enough and the length of the bodice was too short. It fit me like a sports bra, if sports bras were designed to cut your bustline in half horizontally and give you muffin top...
What's worse is that this type of issue is not fixable by alteration. It seems that the pattern drafting team at Birdy Grey doesn't understand that every woman is not flat-chested; when grading a pattern up, you have to deepen the curve over the bust, but that doesn't seem to be happening here. I ordered a medium in the Kiko dress and a large in the Maria, and there was no discernible difference in the depth of the bust curve seams. This simple pattern adjustment would have fixed both the issues of length and cup depth. I wouldn't have come anywhere close to fitting into their Curve collection of dresses, maybe the bust cups are cut appropriately to body proportion in that line, but their regular line is NOT friendly to women with larger cup sizes. Birdy Grey, please figure out a sensible and uniform sizing system!